Download or read book Finite Element Modelling and Molecular Dynamic Simulations of Carbon Nanotubes polymer Composites written by Dhatri Gaddamanugu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling of single-walled carbon nanotubes, multi-walled nanotubes and nanotube reinforced polymer composites using both the Finite Element method and the Molecular Dynamic simulation technique is presented. Nanotubes subjected to mechanical loading have been analyzed. Elastic moduli and thermal coefficient of expansion are calculated and their variation with diameter and length is investigated. In particular, the nanotubes are modeled using 3D elastic beam finite elements with six degrees of freedom at each node. The difficulty in modeling multi walled nanotubes is the van der Waal's forces between adjacent layers which are geometrically non linear in nature. These forces are modeled using truss elements. The nanotube-polymer interface in a nano-composite is modeled on a similar basis. While performing the molecular dynamic simulations, the geometric optimization is performed initially to obtain the minimized configuration and then the desired temperature is attained by rescaling the velocities of carbon atoms in the nanotube. Results show that the Young's modulus increases with tube diameter in molecular mechanics whereas decreases in molecular dynamics since the inter-atomic potential due to chemical reactions between the atoms is taken into consideration in molecular dynamics unlike in molecular mechanics.

Download or read book Modeling of Nanocomposites Reinforced with Carbon Nanoplatelets Using Molecular Dynamics and Finite Element Analysis written by and published by . This book was released on 2005 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs) maybe the greatest discovery in science and engineering at the end of the 20th century and will play an extremely important role in the 21st century. However, the nominal costs associated with the manufacturing of CNTs are still enormous, not to mention the time and efforts that are involved. The cost of manufacturing CNT-based nanocomposites poses an even more serious challenge. An alternative for this problem could lie with carbon nanoplatelets (CNPs), which have been found to be equally effective in reinforcing composite materials. CNPs can reinforce the matrix in two directions unlike CNTs, which are effective only in one direction. In this study, a detailed analysis of the CNPs and their effects on nanocomposites is conducted. The mechanical properties such as the effective Young's modulus of a reinforced nanoplatelet-polymer composite are found out using continuum mechanics and finite element analysis (FEA). Furthermore, molecular dynamics (MD) simulation was carried out on a model with the same volume fraction. Since a quasi-static loading is done on the model, the simulations can also be called as molecular mechanics. However, the theory (apart from the loading process) is based on the MD, thus the molecular simulation process reported in this thesis can also be called as molecular dynamics. The polymer considered is crystalline polyethylene, which is anisotropic in behavior with maximum stiffness in the direction of the chains and a marked change in Young's modulus in the other directions. An anisotropic-material behavior is assigned to this model and analyzed in ANSYS. MD simulations are done using DL_POLY. The polymer is modeled by replicating the crystalline monomer (sometimes referred to as ultra-drawn polyethylene fibers) in the required direction. The final results indicate that the values obtained from the MD simulations and from those of FEA are very much in agreement for a long CNP composite. This can further lead to a conclusion that FEA can be reliably used to predict certain properties such as effective Young's modulus for models whose interfacial properties do not affect the overall load transfer in the composite and MD simulations can be reserved for more complicated analyses such as pull-out and pressure-distribution at the interface of the matrix and the reinforcement problems in nanocomposites.

Download or read book Modeling of Carbon Nanotubes Graphene and their Composites written by Konstantinos I. Tserpes and published by Springer Science & Business Media. This book was released on 2013-10-15 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large part of the research currently being conducted in the fields of materials science and engineering mechanics is devoted to carbon nanotubes and their applications. In this process, modeling is a very attractive investigation tool due to the difficulties in manufacturing and testing of nanomaterials. Continuum modeling offers significant advantages over atomistic modeling. Furthermore, the lack of accuracy in continuum methods can be overtaken by incorporating input data either from experiments or atomistic methods. This book reviews the recent progress in continuum modeling of carbon nanotubes and their composites. The advantages and disadvantages of continuum methods over atomistic methods are comprehensively discussed. Numerical models, mainly based on the finite element method, as well as analytical models are presented in a comparative way starting from the simulation of isolated pristine and defected nanotubes and proceeding to nanotube-based composites. The ability of continuum methods to bridge different scales is emphasized. Recommendations for future research are given by focusing on what still continuum methods have to learn from the nano-scale. The scope of the book is to provide current knowledge aiming to support researchers entering the scientific area of carbon nanotubes to choose the appropriate modeling tool for accomplishing their study and place their efforts to further improve continuum methods.

Download or read book Computational Finite Element Methods in Nanotechnology written by Sarhan M. Musa and published by CRC Press. This book was released on 2017-12-19 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Finite Element Methods in Nanotechnology demonstrates the capabilities of finite element methods in nanotechnology for a range of fields. Bringing together contributions from researchers around the world, it covers key concepts as well as cutting-edge research and applications to inspire new developments and future interdisciplinary research. In particular, it emphasizes the importance of finite element methods (FEMs) for computational tools in the development of efficient nanoscale systems. The book explores a variety of topics, including: A novel FE-based thermo-electrical-mechanical-coupled model to study mechanical stress, temperature, and electric fields in nano- and microelectronics The integration of distributed element, lumped element, and system-level methods for the design, modeling, and simulation of nano- and micro-electromechanical systems (N/MEMS) Challenges in the simulation of nanorobotic systems and macro-dimensions The simulation of structures and processes such as dislocations, growth of epitaxial films, and precipitation Modeling of self-positioning nanostructures, nanocomposites, and carbon nanotubes and their composites Progress in using FEM to analyze the electric field formed in needleless electrospinning How molecular dynamic (MD) simulations can be integrated into the FEM Applications of finite element analysis in nanomaterials and systems used in medicine, dentistry, biotechnology, and other areas The book includes numerous examples and case studies, as well as recent applications of microscale and nanoscale modeling systems with FEMs using COMSOL Multiphysics® and MATLAB®. A one-stop reference for professionals, researchers, and students, this is also an accessible introduction to computational FEMs in nanotechnology for those new to the field.

Download or read book Carbon Nanotube Reinforced Polymers written by Roham Rafiee and published by Elsevier. This book was released on 2017-10-06 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotube-Reinforced Polymers: From Nanoscale to Macroscale addresses the advances in nanotechnology that have led to the development of a new class of composite materials known as CNT-reinforced polymers. The low density and high aspect ratio, together with their exceptional mechanical, electrical and thermal properties, render carbon nanotubes as a good reinforcing agent for composites. In addition, these simulation and modeling techniques play a significant role in characterizing their properties and understanding their mechanical behavior, and are thus discussed and demonstrated in this comprehensive book that presents the state-of-the-art research in the field of modeling, characterization and processing. The book separates the theoretical studies on the mechanical properties of CNTs and their composites into atomistic modeling and continuum mechanics-based approaches, including both analytical and numerical ones, along with multi-scale modeling techniques. Different efforts have been done in this field to address the mechanical behavior of isolated CNTs and their composites by numerous researchers, signaling that this area of study is ongoing. Explains modeling approaches to carbon nanotubes, together with their application, strengths and limitations Outlines the properties of different carbon nanotube-based composites, exploring how they are used in the mechanical and structural components Analyzes the behavior of carbon nanotube-based composites in different conditions

Download or read book Foundations of Nanotechnology Volume Three written by Saeedeh Rafiei and published by CRC Press. This book was released on 2015-05-08 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research notes book, the modelling of mechanical properties of CNT/polymer nanocomposites is presented. The book begins with the structural and intrinsic mechanical properties of CNTs and then introduces computational methods that have been applied to polymer nanocomposites, covering from molecular scale (molecular dynamics, Monte Carlo), m

Download or read book Carbon Nanotubes written by Andy Nieto and published by CRC Press. This book was released on 2021-05-18 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This discovery of carbon nanotubes (CNT) three decades ago ushered in the technological era of nanotechnology. Among the most widely studied areas of CNT research is their use as structural reinforcements in composites. This book describes the development of CNT reinforced metal matrix composites (CNT-MMCs) over the last two decades. The field of CNT-MMCs is abundant in fundamental science, rich in engineering challenges and innovations and ripe for technological maturation and commercialization. The authors have sought to present the current state of the-art in CNT-MMC technology from their synthesis to their myriad potential end-use applications. Specifically, topics explored include: • Advantages, limitations, and evolution of processing techniques used to synthesize and fabricate CNT-MMCs • Emphasizes dispersion techniques of CNTs in metallic systems, a key challenge to the successful and widespread implementation of CNT-MMCs. Methods for quantification and improved control of CNT distributions are presented • Methods for quantification and improved control of CNT distributions are presented • Characterization techniques uniquely suited for charactering these nanoscale materials and their many chemical and physical interactions with the metal matrix, including real-time in-situ characterization of deformation mechanisms • Electron microscope images from premier studies enrich discussions on micro-mechanical modeling, interfacial design, mechanical behavior, and functional properties • A chapter is dedicated to the emergence of dual reinforcement composites that seek to enhance the efficacy of CNTs and lead to material properties by design This book highlights seminal findings in CNT-MMC research and includes several tables listing processing methods, associated CNT states, and resulting properties in order to aid the next generation of researchers in advancing the science and engineering of CNT-MMCs. In addition, a survey of the patent literature is presented in order to shed light on what the first wave of CNT-MMC commercialization may look like and the challenges that will have to be overcome, both technologically and commercially.

Download or read book Relaci n descriptiva de la funci n de jura del se or Don Fernando VII written by and published by . This book was released on 1808 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Constitutive Modeling of Nanotube reinforced Polymer Composite Systems written by Gregory M. Odegard and published by . This book was released on 2001 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a technique has been proposed for developing constitive models for polymer composite systems reinforced with single-walled carbon nanotubes (SWNT). Since the polymer molecules are on the same size scale as the nanotubes, the interaction at the polymer/nanotube interface is highly dependent on the local molecular structure and bonding. At these small length scales, the lattice structures of the nanotube and polymer chains cannot be be considered continuous, and the bulk mechanical properties of the SWNT/polymer composites can no longer be determined through traditional micromechanical approaches that are formulated using continuum mechanics. It is proposed herein that the nanotube, the local polymer near the nanotube, and the nanotube/polymer interface can be modeled as an effective continuum fiber using an equivalent-continuum modeling method.

Download or read book Finite Element Modeling of Nanotube Structures written by Mokhtar Awang and published by Springer. This book was released on 2015-10-24 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a new approach to modeling carbon structures such as graphene and carbon nanotubes using finite element methods, and addresses the latest advances in numerical studies for these materials. Based on the available findings, the book develops an effective finite element approach for modeling the structure and the deformation of grapheme-based materials. Further, modeling processing for single-walled and multi-walled carbon nanotubes is demonstrated in detail.

Download or read book Carbon Nanotube Polymer Composites written by Dimitrios Tasis and published by Royal Society of Chemistry. This book was released on 2015-11-09 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemically-modified carbon nanotubes (CNTs) exhibit a wide range of physical and chemical properties which makes them an attractive starting material for the preparation of super-strong and highly-conductive fibres and films. Much information is available across the primary literature, making it difficult to obtain an overall picture of the state-of-the-art. This volume brings together some of the leading researchers in the field from across the globe to present the potential these materials have, not only in developing and characterising novel materials but also the devices which can be fabricated from them. Topics featured in the book include Raman characterisation, industrial polymer materials, actuators and sensors and polymer reinforcement, with chapters prepared by highly-cited authors from across the globe. A valuable handbook for any academic or industrial laboratory, this book will appeal to newcomers to the field and established researchers alike.

Download or read book Characterization of the Mechanical Properties of Carbon Nanotube based Composites Using the Finite Element Method written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNT) are being used extensively as reinforcing materials at nanoscale in developing new nanocomposites, because of their excellent mechanical properties. Incorporating CNTs in polymer matrices can potentially enhance the stiffness and strength of composites significantly when compared to those reinforced with conventional carbon fibers. However, retaining these outstanding properties at macro-scale poses a considerable challenge. To discover the ways for achieving this entails extensive experimental and simulation studies. Molecular dynamics (MD) simulations have been proved to be an excellent approach in characterizing nanocomposites. Nevertheless, MD is limited to nanoscale due to its extra-ordinary computational costs, which promoted the development and usage of alternate approaches for characterizing CNT reinforced composites at microscale. In this research one of these alternative approaches, the continuum mechanics approach using the finite element method, is employed to estimate the effective modulus of CNT reinforced composites and was successfully validated using other analytical (rule of mixtures) and MD methods. Large-scale models were developed, simulating CNTs using pipe elements for the first time. Results from these models reveal that there exists a limiting value for the length of long CNT, for effective load transfer. It was also observed that composites reinforced with long CNTs yield very high effective modulus compared to those with short CNTs. These results are found to be in good agreement with those obtained using MD and multi-scale constitutive modeling approaches.

Download or read book Modeling and Experimental Characterization of Nanocomposite Materials written by Homayoun Hadavinia and published by MDPI. This book was released on 2020-04-15 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Special Issue gathers research from different branches of science and engineering disciplines working on experiments and modelling of nanocomposites into one volume. The Guest Editor welcomes papers dedicated to experimental, computational, and theoretical aspects dealing with many important state-of-the-art technologies and methodologies regarding the synthesis, fabrication, characterization, properties, design, and applications, and both finite element analysis and molecular dynamic simulations, of nanocomposite materials and structures. Full papers covering novel topics, extending the frontiers of the science and technology of nanoreinforced composites are encouraged. Reviews covering topics of major interest will be also considered.

Download or read book Polymer Carbon Nanotube Composites written by Tony McNally and published by Elsevier. This book was released on 2011-03-28 with total page 849 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the properties of polymer carbon nanotube (CNT) composites is the key to these materials finding new applications in a wide range of industries, including but not limited to electronics, aerospace and biomedical/bioengineering. Polymer-carbon nanotube composites provides comprehensive and in-depth coverage of the preparation, characterisation, properties and applications of these technologically interesting new materials. Part one covers the preparation and processing of composites of thermoplastics with CNTs, with chapters covering in-situ polymerization, melt processing and CNT surface treatment, as well as elastomer and thermoset CNT composites. Part two concentrates on properties and characterization, including chapters on the quantification of CNT dispersion using microscopy techniques, and on topics as diverse as thermal degradation of polymer/CNT composites, the use of rheology, Raman spectroscopy and multi-scale modelling to study polymer/CNT composites, and CNT toxicity. In part three, the applications of polymer/CNT composites are reviewed, with chapters on specific applications such as in fibres and cables, bioengineering applications and conductive polymer CNT composites for sensing. With its distinguished editors and international team of contributors, Polymer-carbon nanotube composites is an essential reference for scientists, engineers and designers in high-tech industry and academia with an interest in polymer nanotechnology and nanocomposites. Provides comprehensive and in-depth coverage of the preparation, characterisation and properties of these technologically interesting new materials Reviews the preparation and processing of composites of thermoplastics with CNTs, covering in-situ polymerization, melt processing and CNT surface treatment Explores applications of polymer/CNT composites such as in fibres and cables, bioengineering applications and conductive polymer CNT composites for sensing

Download or read book Theory and Modeling of Polymer Nanocomposites written by Valeriy V. Ginzburg and published by Springer Nature. This book was released on 2020-12-16 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume brings together the state of the art in polymer nanocomposite theory and modeling, creating a roadmap for scientists and engineers seeking to design new advanced materials. The book opens with a review of molecular and mesoscale models predicting equilibrium and non-equilibrium nanoscale structure of hybrid materials as a function of composition and, especially, filler types. Subsequent chapters cover the methods and analyses used for describing the dynamics of nanocomposites and their mechanical and physical properties. Dedicated chapters present best practices for predicting materials properties of practical interest, including thermal and electrical conductivity, optical properties, barrier properties, and flammability. Each chapter is written by leading academic and industrial scientists working in each respective sub-field. The overview of modeling methodology combined with detailed examples of property predictions for specific systems will make this book useful for academic and industrial practitioners alike.

Download or read book Modeling and Prediction of Polymer Nanocomposite Properties written by Vikas Mittal and published by John Wiley & Sons. This book was released on 2012-12-07 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book series 'Polymer Nano-, Micro- and Macrocomposites' provides complete and comprehensive information on all important aspects of polymer composite research and development, including, but not limited to synthesis, filler modification, modeling, characterization as well as application and commercialization issues. Each book focuses on a particular topic and gives a balanced in-depth overview of the respective subfi eld of polymer composite science and its relation to industrial applications. With the books the readers obtain dedicated resources with information relevant to their research, thereby helping to save time and money. This book lays the theoretical foundations and emphasizes the close connection between theory and experiment to optimize models and real-life procedures for the various stages of polymer composite development. As such, it covers quantum-mechanical approaches to understand the chemical processes on an atomistic level, molecular mechanics simulations to predict the filler surface dynamics, finite element methods to investigate the macro-mechanical behavior, and thermodynamic models to assess the temperature stability. The whole is rounded off by a look at multiscale models that can simulate properties at various length and time scales in one go - and with predictive accuracy.

Download or read book Nanoengineering of Structural Functional and Smart Materials written by Mark J. Schulz and published by CRC Press. This book was released on 2005-08-29 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: In chapters contributed by 24 university & government laboratories, Nanoengineering of Structural, Functional, and Smart Materials combines wide-ranging research aimed at the development of multifunctional materials that are strong, lightweight, and versatile. This book explores promising and diverse approaches to the design of nanoscale